US4829010A - Immunoassay device enclosing matrixes of antibody spots for cell determinations - Google Patents

Immunoassay device enclosing matrixes of antibody spots for cell determinations Download PDF

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US4829010A
US4829010A US07/025,501 US2550187A US4829010A US 4829010 A US4829010 A US 4829010A US 2550187 A US2550187 A US 2550187A US 4829010 A US4829010 A US 4829010A
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antibody
coated
immunoassay device
support
discrete
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Tse W. Chang
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Tanox Inc
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Tanox Biosystems Inc
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Priority to US07/025,501 priority Critical patent/US4829010A/en
Application filed by Tanox Biosystems Inc filed Critical Tanox Biosystems Inc
Assigned to TANOX BIOSYSTEMS INC., 10301 STELLA LINK, HOUSTON, TEXAS 77041 A CORP. reassignment TANOX BIOSYSTEMS INC., 10301 STELLA LINK, HOUSTON, TEXAS 77041 A CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CHANG, TSE WEN
Assigned to TANOX BIOSYSTEMS, INC., 10301 STELLA LINK, HOUSTON, TEXAS 77025 A CORP. OF TEXAS reassignment TANOX BIOSYSTEMS, INC., 10301 STELLA LINK, HOUSTON, TEXAS 77025 A CORP. OF TEXAS ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CHANG, TSE WEN
Priority to PCT/US1988/000728 priority patent/WO1988007201A1/en
Priority to AT88903065T priority patent/ATE83560T1/de
Priority to JP63502983A priority patent/JPH02502569A/ja
Priority to EP88903065A priority patent/EP0353233B1/de
Priority to DE8888903065T priority patent/DE3876799D1/de
Publication of US4829010A publication Critical patent/US4829010A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
    • B01L3/50—Containers for the purpose of retaining a material to be analysed, e.g. test tubes
    • B01L3/508—Rigid containers without fluid transport within
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
    • B01L3/50—Containers for the purpose of retaining a material to be analysed, e.g. test tubes
    • B01L3/502—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures
    • B01L3/5027—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
    • G01N33/544—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals the carrier being organic
    • G01N33/545—Synthetic resin
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
    • G01N33/551—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals the carrier being inorganic
    • G01N33/552—Glass or silica
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00274—Sequential or parallel reactions; Apparatus and devices for combinatorial chemistry or for making arrays; Chemical library technology
    • B01J2219/00583—Features relative to the processes being carried out
    • B01J2219/00603—Making arrays on substantially continuous surfaces
    • B01J2219/00605—Making arrays on substantially continuous surfaces the compounds being directly bound or immobilised to solid supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00274—Sequential or parallel reactions; Apparatus and devices for combinatorial chemistry or for making arrays; Chemical library technology
    • B01J2219/00583—Features relative to the processes being carried out
    • B01J2219/00603—Making arrays on substantially continuous surfaces
    • B01J2219/00605—Making arrays on substantially continuous surfaces the compounds being directly bound or immobilised to solid supports
    • B01J2219/0061—The surface being organic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00274—Sequential or parallel reactions; Apparatus and devices for combinatorial chemistry or for making arrays; Chemical library technology
    • B01J2219/00583—Features relative to the processes being carried out
    • B01J2219/00603—Making arrays on substantially continuous surfaces
    • B01J2219/00605—Making arrays on substantially continuous surfaces the compounds being directly bound or immobilised to solid supports
    • B01J2219/00612—Making arrays on substantially continuous surfaces the compounds being directly bound or immobilised to solid supports the surface being inorganic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00274—Sequential or parallel reactions; Apparatus and devices for combinatorial chemistry or for making arrays; Chemical library technology
    • B01J2219/00583—Features relative to the processes being carried out
    • B01J2219/00603—Making arrays on substantially continuous surfaces
    • B01J2219/00605—Making arrays on substantially continuous surfaces the compounds being directly bound or immobilised to solid supports
    • B01J2219/00614—Delimitation of the attachment areas
    • B01J2219/00617—Delimitation of the attachment areas by chemical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00274—Sequential or parallel reactions; Apparatus and devices for combinatorial chemistry or for making arrays; Chemical library technology
    • B01J2219/00583—Features relative to the processes being carried out
    • B01J2219/00603—Making arrays on substantially continuous surfaces
    • B01J2219/00605—Making arrays on substantially continuous surfaces the compounds being directly bound or immobilised to solid supports
    • B01J2219/00623—Immobilisation or binding
    • B01J2219/0063—Other, e.g. van der Waals forces, hydrogen bonding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00274—Sequential or parallel reactions; Apparatus and devices for combinatorial chemistry or for making arrays; Chemical library technology
    • B01J2219/00583—Features relative to the processes being carried out
    • B01J2219/00603—Making arrays on substantially continuous surfaces
    • B01J2219/00605—Making arrays on substantially continuous surfaces the compounds being directly bound or immobilised to solid supports
    • B01J2219/00632—Introduction of reactive groups to the surface
    • B01J2219/00637—Introduction of reactive groups to the surface by coating it with another layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00274—Sequential or parallel reactions; Apparatus and devices for combinatorial chemistry or for making arrays; Chemical library technology
    • B01J2219/00583—Features relative to the processes being carried out
    • B01J2219/00603—Making arrays on substantially continuous surfaces
    • B01J2219/00659—Two-dimensional arrays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L2200/00—Solutions for specific problems relating to chemical or physical laboratory apparatus
    • B01L2200/06—Fluid handling related problems
    • B01L2200/0689—Sealing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L2300/00—Additional constructional details
    • B01L2300/06—Auxiliary integrated devices, integrated components
    • B01L2300/0627—Sensor or part of a sensor is integrated
    • B01L2300/0636—Integrated biosensor, microarrays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L2300/00—Additional constructional details
    • B01L2300/08—Geometry, shape and general structure
    • B01L2300/0809—Geometry, shape and general structure rectangular shaped
    • B01L2300/0822—Slides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L2400/00—Moving or stopping fluids
    • B01L2400/04—Moving fluids with specific forces or mechanical means
    • B01L2400/0403—Moving fluids with specific forces or mechanical means specific forces
    • B01L2400/0406—Moving fluids with specific forces or mechanical means specific forces capillary forces
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S436/00—Chemistry: analytical and immunological testing
    • Y10S436/807—Apparatus included in process claim, e.g. physical support structures
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S436/00—Chemistry: analytical and immunological testing
    • Y10S436/807—Apparatus included in process claim, e.g. physical support structures
    • Y10S436/809—Multifield plates or multicontainer arrays

Definitions

  • the detection of a cell surface antigen by its specific reactivity with an antibody can be performed in several ways. Immunofluorescence staining, radiobinding assays, agglutination assays and complement-mediated cell lysis are the most commonly used methods. In all these procedures, the determination of the reactivity of the cells with each antibody is handled separately, i.e. the cells are incubated separately in a tube or in a well of a microwell plate, etc. with each antibody to be tested.
  • an immunoassay device called an "antibody matrix” device which allows simultaneous determination of specific cell surface antigens in one reaction incubation by employing orderly arranged antibody spots on a solid surface. It was demonstrated that when an antibody-coated surface is used for the adsorbence of cells, reactive cells adhere microscopically uniformly over minute areas in different parts of the solid surface. Because of this property, antibodies of distinct specificities are coated on small, discrete areas in close proximity forming a matrix-like array on the surface. The spots act as tiny specific immunoadsorbents for cells bearing on their surface the antigens with which the antibodies react.
  • Antibody matrix devices can be used not only to determine the presence of a specific allotype of a surface antigen on the cells of an individual (such as tissue typing), but also to analyze functionally different cell subpopulations that express distinct differentiation antigens.
  • the antibody-coated surfaces can adsorb quantitatively from a mixed population the cells that bear the specific cell surface antigen the antibody react with.
  • the device can be used to determine the proportion of specific subsets in a mixed population of cells.
  • the "antibody matrix” device represents a major simplification of existing immunocytological and immunochemical methodology in that it eliminates the need for repetitive pipetting when a large number of tests for different antigens are performed. Other advantages are that all tests with antibodies may be performed simultaneously in one location, only a single application of sample is required as opposed to the repetitive pipetting of sample into a large number of separate wells or tubes, and very small amounts of sample and reagents are consumed.
  • a preferred way of securing the cover to the planar surface is by four walls which extend upwardly from the support surface and which are secured to the surface. They are arranged in the form of a rectangle which creates an enclosure located at the perimeter of the array of the antibody coated areas.
  • the support and the cover are light transparent.
  • the support surface may be glass or plastic microscope slides and the walls, as well as the cover, may be made of like material.
  • the cover may be flat and planar and supported by walls or may be arcuate in cross section being of unitary construction with its periphery secured directly to the support surface.
  • the walls may be secured to the support surface by a plurality of downwardly depending dowels which fit within mating bores in the support surface or conversely, the dowels may be formed on the support surface and project into bores in the walls.
  • One or more separately enclosed arrays of antibody spots may be located on a single slide.
  • the enclosure may be compound, leaving two or more contiguous chambers of different volumes.
  • the walls may be secured to the surface by appropriate adhesive material, and likewise, the cover may be secured to the top of the walls by appropriate adhesive material.
  • the cover may be either permanently or detachably secured to the surface. For example a permanent or pressure sensitive adhesive may be used.
  • the antibody-coated areas serve as antigen-specific immunoadsorbents.
  • the areas specifically adsorb cells which express surface antigen recognized by the coated antibody.
  • a cell can be identified as having a particular surface antigen by whether it adheres to a spot coated with a cognate antibody.
  • the density and distribution of antibody in the coated spots is such that when cells bearing a surface antigen are brought into contact in sufficient concentration with a discrete antibody-coated area containing antibodies which bind the antigen, the cells adhere tightly to the discrete, antibody coated area and distributed substantially microscopically uniformly are over the discrete antibody-coated area.
  • a sample e.g. a suspension of cells
  • the chamber has a defined height and thus, when a cell suspension is introduced in the chamber and the device is placed on a flat surface, each unit area of antibody-coated surface will receive the same number of cells.
  • the number of cells on per unit area of antibody coated surface can be converted to the number of cells in each volume of original sample (such as blood).
  • FIG. 1 is a plan view of an immunoassay device embodying the features of the present invention.
  • FIG. 2 is a side view thereof.
  • FIG. 3 is an end view thereof.
  • FIG. 4 is a sectional view of a portion of the device on an enlarged scale taken along the lines IV--IV on FIG. 1.
  • FIG. 5 is a detailed sectional view of one form of means for securing the walls to the support surface.
  • FIG. 6 is an alternative means of supporting and whereg the walls
  • FIG. 7 is yet another alternative embodiment for the means for supporting the walls.
  • FIGS. 9 through 11 show other embodiments of the invention on a reduced scale.
  • An immunoassay device shown in the drawings is generally designated 10. It includes a support 12, having a substantially planar surface 14. An array of small, closely-spaced discrete antibody coated areas 16 are located in an enclosed chamber 15 on the support surface and are shown only partially in FIG. 1.
  • the enclosed chamber 15 comprises a cover 16 is spaced from the support surface by a distance D, as shown in FIG. 2, and is located over the array of antibody coated areas 17.
  • the cover is supported on four walls 20, 22, 24 and 26 which are secured to the surface 14 of the support surface 12, and project upwardly therefrom. As herein disclosed they form a rectangular enclosure located at the perimeter of the array of antibody coated areas 16, but it should be understood that other configurations may be employed without departing from the scope or spirit of the invention.
  • the cover 16 being mounted on the walls, extends a distance D above the surface 14 of the support 12 to create, together with the walls a chamber 30.
  • the cover includes at least one aperture 32, which communicates with the chamber 30 for the introduction of the sample into the chamber and there is at least one other aperture 34 (there being two shown in FIGS. 1 and 4) to permit the escape of air when a sample is introduced into the chamber.
  • the cover and the walls may be integral, again creating a chamber 30 defined by the surface 14 of the support and the interior of a unitary member 36.
  • the cover and walls may also be unitary being formed as a bubble or arcuate dome 38 as seen in FIG. 9.
  • FIG. 10 there may be two or more enclosed chambers, 15 and 15' on one support, each one enclosing a matrix of antibody spots. This will allow samples of two different cell concentrations to be tested.
  • the enclosed chamber 15 may also have two (or more) steps 40 and 42 of defined heights (distances D and D').
  • steps 40 and 42 of defined heights (distances D and D').
  • FIGS. 5 through 7 show various means of securing the walls to the support.
  • FIG. 7 shows the wall 20 secured to the support 12 by adhesive material 44 either permanent or pressure sensitive which is compatible with the materials from which the immunoassay device is made.
  • FIG. 6 shows a dowel 46 projecting upwardly from the surface 14 of the support 12 which is engaged within a mating cylindrical opening 48 in the wall 20.
  • the dowel 46 may be formed on the wall 20 and projected downwardly into a cylindrical opening 50 in the surface 14 of the support 12.
  • the function of the array of antibody coated areas as a test surface is described in detail in U.S. Pat. No. 4,591,570, the teachings of which are incorporated herein by reference.
  • the antibody-coated areas form small spots on the surface of the support surrounded by uncoated surface space.
  • the antibodies in the antibody coated spots are conjugated to the surface of the support; they may be either covalently or non-covalently bound thereto.
  • the preferred arrangement of the spots on the surface of the support is a rectangular (preferably square) matrix.
  • a compact 5-20 matrix is preferred.
  • a matrical arrangement permits any spot to be readily identified by reference to coordinates giving the row and column number of the particular spot.
  • the antibody spots should be closely spaced, thereby minimizing the surface space occupied by the complete arrangement of spots and in turn, maximizing the uniformity of cell suspension with which the antibody dots come into contact, and minimizing the amount of sample needed. For instance, a 10 spot by 10 spot matrix should occupy about 1 cm 2 or less of the surface of the support.
  • the support surface 14, in the region or field of the antibody matrix, can be coated with an inert visible material except where the antibody-coated spots 17 are located. This outlines the antibody spot array.
  • the material can be water repellant.
  • a preferred material is tetrafluoroethylene or fluorinated ethylene-propylene.
  • the inner surface of the walls may also be coated with a water repellant material.
  • each spot or each of certain sets of spots (such as the spots in one row or column), is made up of antibodies of single distinct specificity.
  • 100 antibodies of different specificty may be tested, or, if only 10 different antibodies are tested, each of them can be repeated 10 times.
  • the antibody-coated spots serve as minute, specific immunoadsorbents for antigens with which the antibodies react.
  • Antibody-coated spots made up of antibodies directed against a particular surface antigen of cells serve as specific immunoadsorbents for cells bearing that surface antigen. Cell adherence to a spot indicates the presence of the antigen on the cell.
  • the density of antibodies in the antibody-coated spots is related to the function of the spots as immunoadsorbents of cells.
  • the density of coated antibodies, (either covalently or non-covalently conjugated to the surface of the support), must be such that the cells bind tightly to the spots and remain bound during ordinary manipulation of the device in subsequent procedures for detecting cell binds. It is suspected that bridges between the surface antigens of the cells and the antibodies attached to the surface of the support must be sufficiently numerous in order to achieve tight cell binding.
  • the density of antibodies should be sufficient to yield, upon contact with an appropriate concentration of cells which have surface antigens that bind to the antibodies, a microscopically uniform layer of bound cells covering the entire antibody-coated spot. The formation of such a uniform distribution of cells is desirable because it facilities detection of spots to which cells have attached.
  • the density required to generate a microscopically uniform distribution of cells is probably greater than the density minimally sufficient for tight cell binding.
  • the immunoassay device of this invention can be produced by applying small volumes of antibody solutions to the support surface 14 and allowing the solutions to remain on the support 14 until the antibodies become adsorbed to the surface. If desired, the antibodies may be chemically bound to the surface of the support by employing conventional methods for covalently binding proteins to a solid phase.
  • Preferred antibodies for use in the device are monoclonal antibodies. Because the binding of protein to the support surface is dependent on its proportion in solution as well as its concentration, solutions of antibodies must be highly purified in order to obtain a sufficiently dense antibody coat for cell adherance. Monoclonal antibodies can be obtained in sufficiently pure solutions for preparing the antibody-coated spots. However, antigenspecific polyclonal antibodies can also be purified for the purpose of this invention.
  • Antibody spots 16 of sufficient density for cell adherence can be obtained by applying solutions of antibody to the support surface having from about 10 ⁇ g/ml to about 20 ⁇ g/ml protein and being at least about 50% preferably greater than about about 80% pure.
  • the device can be used for antigen determinations as follows.
  • a sample of cells to be tested is placed in suspension in a suitable medium (for example, normal saline).
  • the sample is introduced into the sample chamber 30.
  • the volume of cell suspension needed to fill the chamber 30 and to cover the entire antibody matrix depends upon the size of the chamber. For example, for a 1.2 cm ⁇ 1.2 cm (inner dimension) size chamber of 1 mm height, about 150 ⁇ l of cell suspension is required to fill the chamber.
  • the cells After the cells are introduced into the chamber 30, they are allowed to settle on the test surface, which takes about 5 minutes for a chamber of 1 mm height. After an appropriate reaction time, which is about 20 minutes for a typical procedure. Non-adherent cells are removed from the test surface. This can be accomplished by flushing the chamber 30 with a wash solution. If the chamber cover 16 is detachable it may be removed and the test surface washed. The device may be agitated during the washing step.
  • the matrix of antibody spots is then examined to determine the numbers or amounts of cells bound to each individual spot.
  • the binding of some or all cells to a particular spot indicates that the cells express antigen recognized by the antibody in the spot.
  • Cells may be fixed and stained to aid in quantitation of cells.
  • the number of cells adhered to a spot will indicate the relative proportions of antigen-bearing cells in the original cell suspension.
  • the chamber construction of the immunoassay device provides a number of advantages. When a cell solution is introduced into the chamber it will immediately spread out into the entire chamber space. Antibody spots will be distributed with equal number of cells so that comparison of cell adhesion between spots is accurate.
  • the defined height of the chamber also enables the determination of the numbers of cells per unit volume of cell suspension based upon the numbers of cells per unit area of a spot.
  • the chamber also facilitates the handling of samples. It reduces spillage and dispenses with the need to premeasure sample volume.

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US07/025,501 1987-03-13 1987-03-13 Immunoassay device enclosing matrixes of antibody spots for cell determinations Expired - Lifetime US4829010A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US07/025,501 US4829010A (en) 1987-03-13 1987-03-13 Immunoassay device enclosing matrixes of antibody spots for cell determinations
PCT/US1988/000728 WO1988007201A1 (en) 1987-03-13 1988-03-04 Antibody matrix device
DE8888903065T DE3876799D1 (de) 1987-03-13 1988-03-04 Antikoerpermatrixanordnung.
AT88903065T ATE83560T1 (de) 1987-03-13 1988-03-04 Antikoerpermatrixanordnung.
JP63502983A JPH02502569A (ja) 1987-03-13 1988-03-04 抗体マトリツクス装置
EP88903065A EP0353233B1 (de) 1987-03-13 1988-03-04 Antikörpermatrixanordnung

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EP0353233B1 (de) 1992-12-16
EP0353233A1 (de) 1990-02-07
ATE83560T1 (de) 1993-01-15
JPH02502569A (ja) 1990-08-16
WO1988007201A1 (en) 1988-09-22
DE3876799D1 (de) 1993-01-28

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